Answer
Clomethiazole must not be used during pregnancy, especially the first and last trimesters, unless there are compelling reasons, because safety in human pregnancy is unestablished and animal studies do not show it is entirely free from hazard.
Sources for this answer
- Heminevrin/Clomethiazole 192 mg CapsulesNeon Healthcare Ltd · emc · SmPC §4.6 Fertility, pregnancy and lactation · Version 6Document updated
Sources checked